Use these options to specify how the date range returns results. "Exact" means that the start and end dates of descriptions returned must fall entirely within the date range entered. "Overlapping" means that any description whose start or end dates touch or overlap the target date range will be returned.

This series is comprised of memoranda addressed to Secretaries of Delegation, i.e. Council, and relate to questions examined in Council as well as administrative matters, including appointments of Permanent Representatives and high officials of the Organization, and administrative arrangements for Ministerial Meetings. These memoranda also serve as cover notes for forwarding reports or letters from other political or military bodies ...

This series is comprised of memoranda addressed to Secretaries of Delegation, and relate to questions examined in Council as well as administrative matters, including appointments of Permanent Representatives and high officials of the Organisation, and administrative arrangements for Ministerial Meeting. These memoranda also serve as cover notes for transmitting reports or letters from other political or military bodies, or from a de...

Originally this series covered various types of correspondence, from private letters to memoranda addressed to delegations or to other NATO bodies. In the early 1970's a new series (SG) was created to cover personal communications by the Secretary General, and it was decided that PO memoranda would be used for formal documents addressed to Permanent Representatives for information or decision regarding the work of the Council. P...